Duplex strainer.



E. F. STEWART.

DUPLEXv STRAINER. APPLICATION FILED AUG.8, i917.

1 ,288,25'7. Patented Deo. 17, 1918.

{IIIIIIAIAIlI-lllllllllll /NVE N TOR Mm@ fum/J A TTOHNE Y EDWIN FEBGEBSON STEWART, 0F NEW YORK, N.

DUPLEX STEAINER.

Specioation ci' Letters Patent.

Patented Dec. 17, 1918.

Application led August 8, 1917. Serial No. 186,084.

To all wkm t may concern.'

Be it known that I, EDWIN F. STEWART, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Duplex Strainers, of which the following is a specication.

My invention relates to devices for straining liquids, such as coal tar or other liuids, and concerns particularly an improved construction of such devices whereby I am enabled to readily and thoroughly clean the strainer chambers without resorting to tools such as wrenches, etc., for getting at the oontents of the strainer chambers.

In the types of construction of duplex strainers hitherto in use, as a result of the necessity of keeping such strainers liquid tight against the comparatively. heavy water pressures maintained in such stramers, 1t has been deemed necessary to so posltlon the covers for the strainer and other chambers making up the duplex strainer that the use of tools is required in order to clean the device when not in use or to clean the particular strainerchamber which is not being used. By my invention I am enabled to obtain an improved form of construction possessing' among many advantages subsequently to be enumerated the desirable advantage of being readily assembled and disyte assembled without the use of any tools whatsoever. Referring tothe drawing wherein I have illustrated one embodiment of my invention,

Figure 1 shows in vertical section alongline C-C of Fig. 4 the duplex strainer of my invention;

Fig. 2 is a vertical section of the same along line A-A of Fig. 1;

Fig. 3 is a vertical section of the same along line B-B of Fig. 1;

Fig; 4 is a plan view of the device with the lever operating member for the valve and member closing central chamber omitted; and

Fi 5 is a cross-section of the device along the line D, D of Fig. 1.

Referring to the various figures of the drawing, the device consists essentially of a chambered casting 1 which is in cross-section of substantially'oval shape and is divided by the partition walls D, into the central valve chamber B and .the side strainer chambers A, C. The partltlon walls are integral with the inner walls of the sides of the chambered castlng 1, and are intermediate the ends of such casting so as to leave the clear,

spaces 2, 3 above and below the partition walls respectively. The lower end of the chambered casting 1 isprovided with the integral wall 4 which has a iiange' 5 and 'a central reduced aperture 6 corresponding and collinear with the central valve chamber B. At the top of the chamber B are the orts F, F" and at the bottom the ports G,

these ports serving as communications between the central valve chamber B and the side st rainer chambers A, C.

The upper open end of the chambered casting 1 is provided with the three removable cover members H, J, and H the upper open ends of the chambers A, 4B and C respectively, while the lower aperture 6 is provided with the removable cover mem ber J Each of the strainer chambers A, C is provided with the substantially circular internal flanges N, N adjacent the upper end of the said chambers and of the partition walls D, D. Mounted-on said flanges N, N are the foraminous anged receptacles R, R which may be constructed of any' type and size of screening material ada ted to serve covering vided in the anges 7, 7 of the strainer re' ceptacles R, R to serve the double'purpose of providing means whereby the strainer receptacles may be readily removed from'the strainer chambers for cleanin -andalso as a means to securely position t e strainer receptacles upon the anges N,`N. This latter result is accomplished'by. means of providing the cover members H, H with the inner fianges 8, 8 which bear upon the tops of the eye bolts S, S when the covers are in place and servein this way to securely position the strainer receptacles upon the flan es N, N

T e cover plates H, H' are machined so that a tight joint is eli'ected between the bearing surfaces of such cover plates H, H andthe top flanges of the chambers A, C, which top anges are also machined to a true surface to receive suitable gaskets 9, 9"

upon which the cover plates are forced down by the means illustrated. This means comterior walls of the chambers and C The covers Tl. ll are further provided with eye bolts P, P' which serve as handles to facilitate the removal of such covers. The screws L, L are provided with the hand wheels Q. Q of suiiicient size to permit forcing the cover firmly into its seat so that no leakage whatever will occur, without the use of levers or other tools. The valve chamber B is of substantially rectangular cross-section taken along a horizontal plane, throughout its central part corresponding with the vertical length of the partition walls D, D. The portions above and below the central part of the valve chamber are circular in cross-section in a horizontal plane, the circular portions above and below being provided with the inlet ports F, F at the upper end of the chamber l and the outlet ports G, G at the lower end of said chamber, these ports as already described opening into the opposite ends of the chambers A and C.

Chamber B is further divided into two parts by the partition wall E. the upper part of which is provided with the inlet opening l, while the lower part below the partition wall is provided with the outlet opening C. Valve members in the form of substantially circular segments are provided as shown at T, T to close the ports F and G and F and G', as the case may be, these valves moving in the angular grooves U and U formed between the rings V, V and the flanged covers J, J. The rotating valves T, T are connected by the leve-r castings X, X which are loosely mounted on a shaft l0 of substantially square cross-section extending along the axis of chamber B and engaging studs Y, Y cast as integral parts of the valves T, T. The central shaft is pivoted at the center of the inner face of the cover member J', passes through the double bushing 9 centrally mounted in the partition inember E, extends through a suitable stuihng box in the cover member J, and is provided at its upper end with the lever Z as a means for rotating the shaft and moving the valves T, T so that they may cover the upper and lower ports F, Gr or F, G', as the case may be, and thereby cut oi means of communication between the central valve chamber B and either one of the side strainer chambers A or C respectively.

Inoperation the lever Z of the valve member is swung around so that it is'substan` tiallv centrally over the axis of that particular strainer chamber which is to be left in operation. as where the same haspbeen Ipreviously cleaned,v the lever, therefore, ro-

viding an indicator to show that the va ves T, T cover the ports leading to the opposite chamber which is thel one to be cleaned, and that communication between the central valve chamber and the Strainer Leases? chamber tobe cleaned is cut off, while comniunication between the central valve chamber and the side strainer chamber to be left in operation is open. The liquid to be strained enters by the inlet T and, as shown in the adjustment of the device illust-rated in Fig. l, passes upward and through the open port F into the chamber C downward and outward through the strainer R', through the bottom port G and thence upward and out through the outlet C. In such passage the solid material which itis desired to remove from the liquid is left in the strainer basketfrom which it may readily be removed during a subsequent cleaning operation. Then the strainer member R has been in operation for a sufticiently long time, the valve lever Z is turned so that the Sallie is over the axis of the chamber A which has meanwhile been properly cleaned, thereby putting the chamber C out of operation and putting the clean chamber A into operation. To effect a cleaning 0f the chamber C all that it is necessary to do is to turn the hand wheel Q releasing the pressure exerted by the screw L upon the cover member H', whereupon the swinging yoke K carrying the screw L and the hand wheel Q is rotated to expose the cover member H to permit the same to be removed from its seat on the chamber C bv means of the handle member P. The removal of the cover H releases the pressure exerted on the eye bolts S by the iange 8 of the cover H', thereby permitting the strainer receptacle R to be removed and cleaned and giving ready access to the chamber C for cleaning or other purposes.

The advantages of this type of construction are obvious from the above description. lVit-hout interrupting the continuity of the straining operation and without resorting to the use of tools, a construction is provided that permits of ready assemblage and eitective and easy cleaning of the device.

While the invention has been illustrated in connection with two strainer chambers. it would be understood that more than two may be used without departing from the spirit of the invention.

What l claim is:

1. A duplex strainer comprising a hollow member; a fixed diaphragm dividing said member into upper and lower nortions; an inlet for liquid communicating with one of said portions; an outlet for said liquid communicating with the other of said portions; two strainer chambers connected to said member and-each provided with ports con'miunicating with both of said portions; strainer means within each of said chambers; segmental valves rfor closing the ports between either of the said chambers and the said portions while leaving open the ports between the other of the said chambers and the said portions; and a single valve stem for controlling said valves.

2. A strainer comprising an elon ated hollow member; a fixed diaphragmv ividl ing said member transversely into two portions; an inlet for liquid communicating with one of said portions; an outlet for said liquid communicating with the other of said portions; elongated strainer chambers associated with said hollow member, each chamber being provided with a ort at each end of the same adjacent the sai member and communicating with the said hollow portions; strainer means in each of said strainer chambers; segmental valves for closing the ports between any` one of the said chambers and the said portions while leaving open the ports between lthe other of the said chambers and the said portions; and a single valve stem for controllingsaid valves. l

3. A duplex strainer comprising a substantially closed hollow body; two partition walls within the'hollow body dividing the same into a centralvalve chamber and two side strainer chambers; a transverse diaphragm within and affixed to the central valve chamber dividing said valve chamber into an inlet and an outlet chamber; an inlet for liquid communicating with said inlet chamber; 'an outlet for said -liquid communicating with said outlet chamber; removable strainer means positioned within each of said strainer chambers, each of said strainer chambers being provided with' a port at each end thereof adjacent-the said valve chamber and communicating with said inlet and outlet chambers; and valve controlled means within the valve chamber for closing the ports between either of the said strainer chambers and the said inlet and outlet chambers while leaving open the ports between the other of said strainer chambers and the said inlet and outlet chambers.

4. A duplex strainer comprising a hollow, substantially cylindrical body entirely open at one end and having a reduced central opening at the other end; two partition walls within and spaced from the ends of the hollow body and dividing the same into a central valve chamber and two side Strahler chambers; a transverse diaphragm within a and aixed t0 the central 'valve chamber dividing said chamber into an inlet and an outlet chamber; an inlet for liquid communicating with said inlet chamber; an outlet for said liquid communicating with said outlet chamber; removable strainer means positioned within each' of said strainer chambers; each of said strainer chambers being rovided with a ort at each end thereo adjacent 'fthe said valve chamber and communicating with said inlet and out let chambers; removable covers for the reduced opening and for the open ends of the valve and strainer chambers, the covers for the strainer chambers servin tion the strainer means; and operable means for positioning the covers over the open ends of the strainer chambers in aliquid tight manner; and valve controlled hollow body; two partition walls Within the hollow body and dividing the same into a central valve chamber and two side strainer chambers; a transverse diaphragm within and aiixed to the central valve chamber dividing such valve chamber into an inlet and an outlet chamber; an inlet for liquid also to posi-A communicating with said inlet chamber; an

outlet for said liquid communicating with said Ioutlet chamber; removable strainellu.

means positioned within each of said strainer chambers; each of said strainer chambers' beingl closed at one end and open at the other end, and having a side wall of the same provided with inlet and outlet ports adjacent the ends'of the valve chamber, an interior flange spaced from but located near the open end of the 'strainer chamber, a foraminous strainer rece tacle supported within said strainer chamber upon said ange, elongated means associated with said strainer receptacle serving as means to assist in the removal of the same, a removable cover for the open end of the strainer chamber, said cover serving to position the strainer receptacle in place on the said iiange, hand operable means adjacent the said open end and associated with the strainer chamber for applying great pres sure to said cover to position the same on the said open end in a liquid tight manner; and valve controlled means within the valve chamber for closing the ports between either ofthe said strainer chambers and the said inlet and outlet chambers while leaving open the ports between the other of said strainer lehambers and the said inlet and outlet chamers. r

6. A duplex strainer comprising a hollow, substantially cylindrical body entirely open at one end and having a reduced central opening at the other end; two partition l Cil a central valve chamber and tvvo side strainer chambers; a transverse .diaphrL m within and atlixed to the central cham er dividing said chamber into an inlet and an outlet chamber; an inlet for liquid communicating with said inlet chamber; an outlet for said liquid'communicating with said outlet chamber; removable stralner means positioned within each oi said strainer chambers; each of said strainer chambers being closed at one end and open at the other end, and having a side Wall of the same provided with inlet and outlet ports adjacent the ends of the valve chamber; an interior flange spaced from 4but located near the open end of the strainer chamber, a oraminous strainer receptacle supported Within said strainer chamber upon said flange, elongated means associated with said strainer receptacle serving as means t0 assist in the removal of the same, a removable cover for the open end of the strainer chamber, said cover serving to position the strainer receptacle in place on the said Harige, hand operable means adjacent the said open end Laeaaa'? and associated with the said strainer chamber for applying great pressure to said cover to position the same on the said open end in a liquid tight manner; removable covers for the reduced opening and for the open end of the valve chamber; a valve controlled means Within the valve chamber for closing the ports betweeneither of the said strainer chambers and the said inlet and outlet chambers While leaving open the ports between the other of said strainer chambers and the inlet and outlet chambers.

7 ln a liquid strainer a central chamber and side chambers; outlet and inlet ports leading from the said central to the said side chambers; a fixed diaphragm dividing the central chamber into two portions; a valve stem extending through said diaphragm; said valve stem having valves controlling said ports so as to close one outlet and the corresponding inlet port While leav ing the other ports open. Y

ln testimony whereof l aiix my signature.

EDWIN `FERC-fERSON STEWART. 

